Celtibeerian are a Spanish band. They were formed in 2010 and released their first album a year later. Since then they have released several more albums and toured extensively throughout Europe. The members of the band are: Gustavo "Gus" Infantes on lead vocals, and bass; Patricia "Patri" San Martín on violin and vocals; Julián Yagüe on guitars; David "Dagda" Sánchez on vViola, whistles, bagpipes, and bouzouki; and Victor "Vity" Fernández on drums and percussion.

The Harvest Song was originally released on the 2017 album Deiwos [Deity]. It is about having an all night party, with food, drink, and dancing, to celebrate the harvest. It is a heavy piece of folk inspired rock to celebrate a traditional folk occasion, and it sounds like a party that no-one would want to miss.